diff --git a/CHANGELOG-2.1.md b/CHANGELOG-2.1.md
index e9b700f05d..7622132b70 100644
--- a/CHANGELOG-2.1.md
+++ b/CHANGELOG-2.1.md
@@ -12,6 +12,7 @@ To get the diff between two versions, go to https://github.com/symfony/symfony/c
 
 ### FrameworkBundle
 
+ * [BC BREAK] assets_base_urls and base_urls merging strategy has changed
  * changed the default profiler storage to use the filesystem instead of SQLite
  * added support for placeholders in route defaults and requirements (replaced by the value set in the service container)